public static IHttpClient WithCookies(this IHttpClient httpClient) => httpClient.AddExtension(new CookiesHttpClientExtension());
public static IHttpClient WithFakeClaimsPrincipal(this IHttpClient client, ClaimsPrincipal principal) => client.AddExtension(new FakeClaimsHttpClientExtension(principal));
public static IHttpClient WithHeader(this IHttpClient httpClient, string name, string value) => httpClient.AddExtension(new HeaderHttpClientExtension(name, value));